N10-008 Network+ Exam Prep (Professor Messer) 2022/2023

What is the OSI, Open SysTest Interconnect Model? - ANSWER A 7-layer model that describes how traffic moves from one place to another. It didn't catch on and was replaced by TCP/IP Mnemonic for Remembering OSI model L ...

What is the OSI, Open SysTest Interconnect Model? - ANSWER A 7-layer model that describes how traffic moves from one place to another. It didn't catch on and was replaced by TCP/IP Mnemonic for Remembering OSI model Layers? - ANSWER All People Seem To Need Data Processing Describe the Application layer of the OSI Model. - ANSWER All - The Layer we see, Basically the applications that are open on your phone or computer. Characterized by what you're looking at, your eyes. Describe the Presentation Layer of the OSI Model. - ANSWER People - Where Character encoding and application encryption happen. This is often combined with the Application layer however, the presentation layer is responsible for protocols like JPEG and MP3 hat are used BY applications to present their service. Characterized with APplication encryption (SSL/TLS) Describe the Session Layer of the OSI Model. - ANSWER Seem - Manages communication between devices (Start, Stop, Restart) and is where Control and Tunneling protocols live so HTTPS for example.Characterized by Control Protocols and Tunneling Protocols (VPN protos for example) Describe the transport layer of the OSI model. - ANSWER To - Describes how and where data is being delivered to a system. This is where TCP and UDP live. Characterized by TCP Segments and UDP datagrams Describe the network layer of the OSI Model. - ANSWER The "routing" layer of the network, or the LOGICAL layer where Ethernet frames are fragmented to traverse different networks. Characterized by IP Addresses, Routers, and Packets Describe the Data Link Layer of the OSI Model - ANSWER Data - The "switching layer" It's the basic network language where Data Link Control protocols live (MAC Addresses). Characterized with Frames, Mac Addresses, Extended Unique Identifiers, and Switches Describe the Physical layer of the OSI Model - ANSWER Processing - The physics of the network. The Physical layer is for things like cabling, signaling and connectors and there are no protocols at this layer. it's all about the medium. Characterized by Cables Fiber, and the Signal itself. What is a Protocol Data Unit? - ANSWER A protocol data unit (PDU) represents a specific set of data at each layer of a model, like OSI. The Physical layer might have an Ethernet frame as it's PDU, but the network layer will have an IP packet as it's PDU Explain Encapsulation and Decapsulation - ANSWER Applying and removing layer-specific headers to a unit of data to help it move from one layer to another. Frame headers are at adata link,IP headers are at the network layer and TCP headers are at the transport layer What are TCP Flags? - ANSWER TCP Flags are used to indicate the state of a connection or to provide additional useful information for troubleshooting or to handle a control of a particular connection. (SYN,PSH,RST,FIN) What is a Maximum Transmission unit (MTU)? - ANSWER And MTU Defines the largest chunk of data that may be transmitted as a single unit. This is important to know for tunneling protocols on your network; If your tunneling protocol has a packet size greater than the MTU of that network, the tunneling protocol isn't going to work. What kids of copper cabling are there? - ANSWER Twisted Pair, Coaxial, and Twinaxial Cable What is Twisted Pair Copper Cabling? - ANSWER Typically 2 to 4 sets of twisted copper cables that either transmit or recieve information. The Twist keeps the signal constantly moving away from interference. and there are two standards for wiring it, T568A and T568B What is Coaxial cable? - ANSWER Typically used for cable modem and TV Connections (RG6), Coaxial means it shares a common axis. (The Copper contact shares the same axis as it's cladding, and buffer coating.